for the record, at the moment I'm able to get it working using "transport_maps_domain", but that is actually, according to you, a step too much.

I have the idea that this might be an issue in earlier versions too.

]]>Fri, 16 Nov 2012 10:13:59 +0000http://www.iredmail.org/forum/post19114.html#p19114http://www.iredmail.org/forum/post19112.html#p19112
As a backup mx, it should accept all emails to backup MX domain without verifying accounts existence. Then it will contact primary domain, if primary domain is up and running, backup mx will forward all emails to primary domain.

With custom transport, it simply relay all emails to another smtp server.

Your Postfix and Dovecot config look just fine, i have no idea why it reports "user unknown".

I've tried commenting out $relay_recipient_maps in the proxy_read_maps line of main.cf

Please don't do this.

jer wrote:

seems this is fixed by setting mtaTransport

Then this is not a backup mx. You relay all emails to smtp server set in mtaTransport.If backup mx doesn't work, could you please show us output of command "postconf -n"? And content of file /etc/postfix/ldap/relay_domains.cf (remove password before posting)?

]]>Fri, 16 Nov 2012 03:43:44 +0000http://www.iredmail.org/forum/post19095.html#p19095http://www.iredmail.org/forum/post19078.html#p19078
seems this is fixed by setting mtaTransport which is not explicitly in the documentation as far as I could tell (it sounded like an option).

Might be obvious but I've searched almost every topic and this wasn't explicitly said.

So please set: mtaTransport to : "smtp:domainname:25" to get things to work (or with [A-record] if you have an A-record you wish to point your domain to.